反相微乳液法制备纳米PMMA-SiO_2复合微粒  

Preparation of PMMA-Silica Nanocomposite Particles by Inverse Microemulsion Method

作　　者：许湧深[1] 邱守季[1] 杨磊[1] 葛悦[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2014年第4期321-325,共5页Journal of Tianjin University：Science and Technology

摘　　要：以甲苯为连续相、水为分散相、十二烷基苯磺酸为乳化剂兼作催化剂、正戊醇为助乳化剂,制备反相微乳液.然后引入正硅酸乙酯(TEOS),在水核中形成二氧化硅纳米粒子.接着加入通过溶液聚合制备的甲基丙烯酸甲酯(MMA)和γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)共聚物的甲苯溶液,实现共聚物对纳米二氧化硅的包覆.通过TEM、FTIR、TG等测试,证实得到了共聚物包覆二氧化硅的核壳结构纳米粒,平均粒径约为36,nm.当共聚物中KH570质量分数为5%时,获得最高的包覆率,聚合物占复合粒子质量的47%.Inverse microemulsions were prepared with toluene as continuous phase, water as dispersed phase, dodecylbenzene sulfonic acid（DBSA） as emulsifier and catalyst, and n-pentanol as co-emulsifier. Then tetraethylorthosilicates（TEOS） were introduced into the inverse microemulsion to hydrolyze and condense, forming nanosilica particles in the water pools. Subsequently the solutions of copolymer of methyl methacrylate（MMA） and γ-methacryloxypropyltrimethoxy silane（KH570） in toluene were added to the inverse microemulsion. Thus the nanosilicas were encapsulated by copolymer via the co-condensation reaction of silanols between the copolymers and silica. It was evidenced by TEM, FTIR, and TG characterization that the core-shell structured PMMA-silica nanocomposite particles with an average size of 36,nm were obtained. The mass fraction of polymers encapsulated in the nanocomposites was 47% when the mass fraction of KH570 in the copolymer was 5%.

关 键 词：反相微乳液 二氧化硅 包覆 纳米复合 

分 类 号：O635[理学—高分子化学]